Abstract
Operation scheduling problem is one of the most important issues to efficiently manage the electric power supply and demand in power grids, especially in microgrids. This problem is formulated as a complicated optimization problem having multiple optimization variables. In the problem framework, we need to set an appropriate reserve power against the uncertainty in forecasted values of the electric power demand and the output of variable renewable energy-based generation systems. This paper presents a problem framework and its solution method to make an aggregated schedule of operation of controllable components in microgrids and electricity trade with electricity market. Traditionally, the reserve power in the operation scheduling problems is set to compensate a certain variation of net loads, which are calculated by the sum of forecasted values of the demand and the output of variable renewable energy-based generation systems. However, it is desirable to set the reserve power flexibly considering distribution characteristics of forecast errors of the net load. In the proposed problem framework, the necessary operating reserve is automatically calculated by reflecting the uncertainty-originated risk to the objective function. Through numerical simulations and discussions on their results, usefulness of the authors’ proposal is verified.
